Linear vibration motor

Abstract

The present invention makes thinness or widthwise compactness possible, while exhibiting the advantages of obtaining stable vibrations and excellent impact strength, just as in a linear vibration motor equipped with a fixed shaft. A linear vibration motor equipped with: a needle equipped with a magnet and a spindle part; a frame for slidably supporting the needle in one axial direction; a coil for driving the magnet in the one axial direction, and affixed to the frame; and an elastic member for imparting an elastic force to the needle in opposition to the driving force imparted on the magnet. Therein, the needle is equipped with a pair of shaft parts which project in opposite directions in the one axial direction, and the frame is equipped with bearings for slidably supporting the pair of shaft parts.

The invention claimed is: 
     
       1. A linear vibration motor comprising:
 a movable element comprises a magnet and a weight portion; 
 a frame containing the movable element; 
 a coil, secured to the frame, driving the magnet along an axial direction; 
 an elastic member applying, to the movable element, an elastic force that opposes the driving force that is applied to the magnet, 
 wherein the movable element further comprises a pair of shaft portions that protrude in mutually opposing directions along the axial direction, 
 wherein the frame further comprises respective bearing portions that support the pair of shaft portions so as to be able to slide, 
 wherein the frame further comprises a stationary spring bearing portion supporting one end of the elastic member; and the bearing portion and the stationary spring bearing portion are provided in a single combined component, 
 wherein the single combined component is provided with a first plate piece part that serves as a side wall of the frame, and a second plate piece part that is provided extending from the bottom face of the frame; and the stationary spring bearing portion is provided on the first plate piece part and the bearing portion is provided on the second plate piece part. 
 
     
     
       2. A linear vibration motor comprising:
 a movable element comprises a magnet and a weight portion; 
 a frame containing the movable element; 
 a coil, secured to the frame, driving the magnet along an axial direction; 
 an elastic member applying, to the movable element, an elastic force that opposes the driving force that is applied to the magnet, 
 wherein the movable element further comprises a pair of shaft portions that protrude in mutually opposing directions along the axial direction, 
 wherein the frame further comprises respective bearing portions that support the pair of shaft portions so as to be able to slide, 
 wherein the frame further comprises a stationary spring bearing portion supporting one end of the elastic member, and the bearing portion and the stationary spring bearing portion are provided in a single combined component; and 
 a movable spring bearing portion supporting the other end of the elastic member and provided at an end portion of the movable element at a position that is separated, by a setting dimension, from the shaft portion, 
 wherein the bearing portion and the stationary spring bearing portion are provided at positions that are separated by the setting dimension. 
 
     
     
       3. A linear vibration motor comprising:
 a movable element comprises a magnet and a weight portion; 
 a frame containing the movable element; 
 a coil, secured to the frame, driving the magnet along an axial direction; and 
 an elastic member applying, to the movable element, an elastic force that opposes the driving force that is applied to the magnet, 
 wherein the movable element further comprises a pair of shaft portions that protrude in mutually opposing directions along the axial direction; and 
 wherein the frame further comprises respective bearing portions that support the pair of shaft portions so as to be able to slide, 
 wherein the weight portion is connected to both axial-direction end portions of the magnet and the pair of shaft portions protrude from both axial-direction end portions of the weight portions, 
 wherein a recessed portion having a width that enables insertion of the bearing portion is formed along the axial direction in an end portion of the weight portion from which the shaft portion protrudes.